Roma ended their winless streak with a 2-0 victory over Genoa in Serie A on Sunday to relieve some of the pressure on coach Rudi Garcia.
League leader Inter Milan eased through to the Italian Cup quarter-finals by beating Cagliari 3-0, while third-division Alessandria also advanced after upsetting Genoa 2-1 on Tuesday.
Midfielder Felipe Melo got a head injury after a clash with his teammate in a 1-0 home win against Genoa on Saturday.
Adem Ljajic scored the only goal of the match as Inter won 1-0 for the eighth time in their 15 league matches this season.
Inter Milan were jeered off at San Siro again after a 0-0 draw with Chievo.
Tevez scored the winning goal through a magnificent finish to increase his tally to a league-leading 16 goals in the season.
Juventus' third straight victory by the same scoreline puts them 17 points clear with 10 games left before second-placed AS Roma visit Cesena later on Sunday.
Sampdoria drew 1-1 at home to Genoa in a Serie A derby on Tuesday that left the two sides level on points in the fight for a European place.
The capital side remained sixth following a second successive defeat, two points and a place above Genoa, which arrested its slide down the table with its first win in eight rounds.
Napoli beat Genoa, moving back into third place in Serie A and also they moved two points ahead of Lazio and Sampdoria in the race for the final Champions League spot.
Inter Milan gave coach Roberto Mancini his first home Serie A win since his return to the club in November when they beat fading Genoa 3-1.
Sampdoria and Genoa missed the chance to end the year in third spot as both teams failed to win in the final round of Serie A fixtures before the winter break.
Genoa moved provisionally into third place in Serie A as they cruised to a 3-0 win at Cesena, while AC Milan earned a 2-0 victory at home to Udinese.
A stoppage-time goal saw Juventus fall to their first league defeat since March, allowing Roma to move level at the top of Serie A.
Genoa were held to a controversial 1-1 draw by visiting Empoli on Monday in the first match since the port city was hit by devastating floods.
The 21-year-old Sturaro will be loaned back to Genoa for next season before joining Juventus in 2015.
Juventus came from behind to win 4-1 at Cagliari and maintain their eight-point advantage over second-place Roma.
Mario Balotelli failed to convert a penalty kick and AC Milan were held to 1-1 by 10-man Genoa at the San Siro.
Napoli eased to a 2-0 win at Genoa to move provisionally top of the Serie A standings on Saturday, thanks to a double from Goran Pandev.
The Italian football federation said the charges include rigging games and failing to report match-fixing for two Serie A games.